Telephone-transmitter



iINiT ED STATES FATENT :VILLI'AM A. MOORE, OF BROOKLYN, NEW YORK.

' TELEPHQNE=TRAN$MTTERL SPECIFICATION forming part of Letters Fatent No. 563,395, iiated July 7, 1896.

Application filed March 25, 1896. Serial No; 553M737 (H0 mmiel.) I

Jo' all whom it may concern;

Be it known that 1, WILLIAM A. Moons, a,

citizen of the United States of Americmtind a resilient of'Brooklyn, in the county of Kings 5 and State of N ew York, haveinvented certain new and useful Improvements in Telephonic Transmitters, of which the following is a specificctiosgreference being had to the accompanying drawings, forming part of the seine, in WiliCh- I Figure 1 is acentral vertical sectional View through an apparatus embodying my invent on; and Fig; 2 is a cross-sectional View on line so :21, Fig. 1, the comminuted conducting J material having been removed to more clearly exhibit the other parts.

M y invention relates to telephone-transmit tors; and. it consists in the devices and combiimtion'of devices hereinafter described and claimed.

C is the case, the forward portion coming to a suitable size to hold the mouthpiece M, arid within the case (which-is prefersbly'circular in form) there is a shoulder S. I Against this shoulder rests the first'diepln'agm D, which I esotere of oileti silk. At a very erefromgmeasured by a ring substance, interposed betfie second diaphragm D1, both in piece by yoke-syringe s,'secu1*ed o" case and bearing upon the .;cconci This second diaphragm also provide with escries of'projectioiis p, on the sicic farthest from the mouthpiece,

and the center on the opposite side I put ft tom 1,, of such size that it will Test against This button, how

thc diaphragm D.

ever, might be secured to the first diaphragm: e ml rest agaiast the second, although I prefer the arrangement shown; The projection p .I prefer to strange within the peripheiy of Hi cii'cloconccntgic with the .ce iterof thetlia; iiillaig'illand exteyiding over a comparatively wit-iii portion of its surface, say about one third its iiimzicter. The rear portion oithe case I prefer to fit to the other pa-rt'by pi'o vitling each with suitable scrcw threads, as

shown irg. Fig. 1. To the rear part Lsecnre a l if, prefersbly'of' non-conducting ma on the e nearest the diaphragm och (l with a circular recess sich sobstentieily e0 "responds in size to or a little exceeds the the projec-v area of the surface covered by tions 19. This block is also provided on the same face with a groove or e rabbet g, in which I seeta ring of non-ccnducting mate rial, preferably fe1t,'f, which beerslightly against the diaphragm D. The degree of prossure,es is manifest, may be easily regulated of the ease tel-theiby turning the rear part Oll or oi the sides of the case oymeens of the screw-threads already named. in the recess "R, I place a solid carbon 0, usually correspoiiding in size with the width'of the' ecess,

but preferably not so thick as the depth of the recess. Its face is channeled, as shown, and it is also provided with a series of small recesses '7', one, 0", being preferably arranged i nthe center. In this center recess I place a screw .9, which. extends through the carbon andlinto a 106 of coiiducting material 9 thereby securing the carbon to said rod In the recess 'r' and over-the screw I seat a small piece of conducting material f, to pre- Vent short-circuiting. About the rod r 1' place a tube of insulating material and about it tube of brass or other suitable EH81". teriel t, the other face of'wliieh for some (iletcnce intermediate its ends is screw-tliu'eacled, as shown, the other end. being preferably squared to receive thumb-piece T.

Rising from the rear face of-tiie' case or secured toit is a boss B, lthss two steps, the first, 2t circular one; over which may be passed the suspendi ig bracket B The next step is scretflthrcsded, and on it place anut N, the tluiiiibeiiecefii.being: I the tube tend seemed after the 11515 N has been turned to place.- It will thus be seen tb'fit the bracket 3 is held between the stag; on the boss and the 'imt N, so that the instrument is suspended. At the same time it may readily be turned about in the operture in saici bracket H, as may be desired.

It is also manifest that by holding the case fixed and turning the lillllillh PlQCQ T the carbon C may be sdysnced toward or withdrawn from the ('liaphmgm D to; sdjustniicnt independently of eny'adj ustment of the i i-oak A set-screw Smey be seatediii the boss B for holding the tube med thereby the cm" bon C in its suitablyetigustcd position. One

i ittwirei c ieeiis fromtl e tiiaphregm to and through the caseandto a binding-screw or it may lead to the case, and that being made of conducting material may be otherwise conducted to its binding-screw. Another 5. conducting-wire w leads from the, screw 8 set in the rod 4, to the-second binding-screw 's. The whole is preferably mounted in a box B, the case being inserted through a circu- V lar hole' in its face and the bracket B se- IO being preferably arranged: as a door. H

Between the diaphragm D andthe solid carbon C", I place. aquantity of finely-divided conducting material, such as"powdered carbon, and thepurpose of the recesses q in .the face of said carbon is that in filling in the wdered material it may enter in these re- 'cesses, and therefore when the device is turned up on its side, by falling out of said recesses into'the space between the face of the solid carbon and the diaphragm D, it will furnish a sufficient quantity to well fill said space without requiring such care and exactnes'sin filling before adjustment, and yet will leave the powdered material somewhat loose that it may not pack between the parts.

The use of the two diaphragms withthebutton between enables me to secure more powerful vibrations than would otherwise be the case, foras I use and must usesome mate; rial placed'between the block 13 and the diaphragm DY (here the felt ring f) to complete the inclosure of the space to be occupied by the finely-divided material, the vibrations of that diaphragm D, if it were itself exposed to the'immediate action of the sound-waves would be somewhat deadened, but by placing the first diaphragm D in front of that I preserve the full action ofa diaphragm of that size, andcommunicate the full'effect' of its vibrations directly to the centerof the second diaphragm (the place where that will have nice?) effect) through the medium of the button r have heretofore wrapped the piece of felt about the solid carbon, with its edge arranged tobear upon the diaphragm similar to diaphragm D; but this I- find objectionable in that when adjusting the solid carbon the felt so is also moved to or from the diaphragm, and

' may therefore press too lightlyor too strongly upon it when the carbon'has been properly adjusted. .The arrangement now shownenab came to adjust each independently, and 5 5 thereby secure exactly such results as I seek. What I claim as my invention, and desire to secure by Letters Patent, isv 1 In a telephone-transmitter the combination of a recessed block, a diaphragm whose rim is supported independently of said block, and an annulus of soft non-conducting material whose interior diameter is greater than the diameter of the inclosed solid carbon interposed betweenthe two and completing the inclosure of a space bounded by the dianhragm, the walls of the recessin the block and, the annulus, a solid carbon seated in cured-to the inner-side of said box, that side case, a button located said recess in the block and a quantity of finely divided conducting material inter posed between the face of the solid carbon and the interior face of the diaphragm substantially as set forth.

2. In a telephone-transmitter the combination of arecessed block, a diaphragm whose. rim is supported independently of said block, and an annulus of soft non couducting material whose interior diameter is greater than the diameter of the inclosed solid carbon interposed between the two and completing the inclosure of a space bounded by the diaphragm, the walls of the recess in the block and the annulus; a solid carbon provided with recesses extending inwardly from its interior face seated in said recess in the block anda quantity of finely-divided conducting material interposed between'the face of the solid ,divided conducting material interposed between the projections on the diaphragm and the face of the solid carbon within the space inclosed by the diaphragm, the block and the.

rin p In a telephone-transmitter the'combination of a diaphragm, a recessed block set opducting material intermediate the diaphragm and the block and surrounding the recess therein, a solid carbon placed in the recess, a

rial placed intermediate'the diaphragm and the carbon and means substantially as described for independently adjusting the position ofthe block and the position, of the carlion with relation to the diaphragm.

5. Thecombination of a telephone transmitter of a case, an oiled-.silk'diaphragm supported at its rim within said case and opposite the mouthpiece, a second diaphragm supported within the case beyond the first and held' in position by springs secured to the at the center of the second diaphragm and making contact with the first, aseries of projections extending inwardly from the second diaphragm, a recessed block secured to the rear face of the case, which said face is screw-threaded to the sides of the case, a ring of soft non-conducting material placed intermediate the second diaphragm and the block, a solid carbon placed in the recess in said block and supported on a tube extending through a screw-threaded carbon and-the interior face of the diaphragm posite said diaphragm a ring of soft non-con- IIO quantity of finely-divided conducting mate- 7 boss on the rear face of thecase, a conductdivided conducting material interposed being-rod extending from the solid carbon tween the diaphragm and the solid carbon through the tube, from which it ,isinsulated, all-combined substantially as set forth. to a suitable connection, a bracket with a cir- In testimony that I claim the foregoing as 15 5 eular aperture in which the boss of the case myinven-tion I have signed my name, in presis seated, a nut placed upon said boss but beence of two witnesses, this 7th day of March,

yond the bracket, a thumb-piece secured .to 1896.

the tube but beyond. the nut a connection \VILLI AM A. MOORE. leading from the diaphragm, a series of re- \Vitnesses: [O cesses extending inwardly from the face of RALPH W. GLOAG,

the solid carbon and a quantity of finely- JNO, .TOLINS ROSS. 

